工作就用美篇工作版","guide_search_desc":"海量模板范文,一键做同款 工作就用美篇工作版","img_beautify_switch":0,"ad_free":0,"text_direction":2,"template":{"id":5,"series_id":2,"theme_id":2},"container":{},"redirect":{"redirect_type":1,"img_url":false,"link_url":"/wap/downloadpage/backpage","button_bg_color":false,"button_desc":false,"redirect_desc":false},"edit_date_str":"更新于 2017-12-13","current_time":1743761979,"font_name":"","rcmd_meipian":0,"hide_article_link":0,"from_wechat":false,"topk_keywords":[{"name":"循环小数","score":0.614497},{"name":"学生","score":0.242381},{"name":"无限","score":0.231646},{"name":"循环","score":0.187422},{"name":"相除","score":0.175435},{"name":"商是","score":0.16759},{"name":"周英","score":0.111727},{"name":"这节","score":0.111727},{"name":"猜想","score":0.108234},{"name":"余数","score":0.105941}],"music_name":"","origin_status":0,"password_v2":"","font_id":0,"title_style":"","rich_text_title":"","enable_download":1,"cover_thumb":"https://ss-mpvolc.meipian.me/users/28288221/fc52b4dbcefe4b9f9a2c1ac526b47604_crop__jpg.heic","has_video":false,"gift_switch":1,"enable_watermark":0,"content":{"article_id":76746966,"content":[{"text":"
基于学生在学习\"循环小数\"后,对有关无限不循环小数等的一些课外知识的好奇和困扰,周英老师给我们带来了这节拓展性课。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/2056169dcce64f01b56019622f871e4c__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/3f8731834c8649918b1cc2f53c1cd446__jpg.heic","img_width":1200,"text":"课始,观看微课,通过计算聚焦到商的可能性,让学生对商是不是存在无限不循环的情况产生疑惑,引发思考,提出问题:两个数相除会不会出现无限不循环小数?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/6db7df3db8ec4ce1a8d66b8f460034b6__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/2ba826d450f74aa787be944ad13155ef__jpg.heic","img_width":1200,"text":"怎么研究?
生:通过计算。
给出4,9,10,17四个数,任选两个数相除
如果要出现商是无限不循环小数,最有可能是哪两个?
17÷9 4÷9 10÷17
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/33727d39b92c4b2cb7d526821dab1b29__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/022087aa9da3428a97d72caccc80f768__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/bd1a00215c42433a9d21eca64fe03a03__jpg.heic","img_width":1200,"text":"一起来研究10÷17的商会不会是无限不循环小数?
同桌合作:一个算,一个检查,并记录在表中。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/567c99eae3b644cf9cfb05732972adb9__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/558edd16fc6240ebb027a5d325ace0e0__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/49ccc3fa3779424395cfaa25ee1c42e1__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/5bd11c18978a415d941dbd1301384e59__jpg.heic","img_width":1200,"text":"答案是无限不循环小数么?
汇报结果。
它的循环节有几位?一起数一数。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/faad3504b9ba4e9e8861c31de6d919fb__jpg.heic","img_width":1200,"text":"对比两位学生的研究过程和计算方法,怎么判断它已经循环了?
你有什么发现?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/3fbd53d878504e11867c9510fe62baed__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/e74b97c3ea27432e9f7d7aabfe112370__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/801ceff030914e34b64a9eb2ad6501cd__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/9b65ac33fc2041e0a0317a3a21d5c69d__jpg.heic","img_width":1200,"text":"观看视频,边核对,边思考,为什么10÷17的商是循环小数?为什么循环节是16位?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/24593cb369fe4e1183ce1e37396c7e83__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/95d0b912f6394267b91e75e798497b9b__jpg.heic","img_width":1200,"text":"通过圈一圈,画一画,写一写,发现循环节和除数的关系。
当余数出现重复,商才会循环。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/a81d3987b6c34797bd573df7a325d906__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/88628e8851ca4fdf8694848fe7927745__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/05752031eba640ef921ff1c75662e30f__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/e709be838b294b058fe703c88a4268ee__jpg.heic","img_width":1200,"text":"一个数÷23的商会不会是无限不循环小数呢?
生:可能是整数。
如果除不尽,有可能吗?你能从余数考虑吗?
那么( )÷27 和( )÷41 呢?
老师给出准确答案,验证刚才的猜想。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b3a53232a27e4a8e87f4b9c389c752ee__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/68936977d9024fc191a1f50b38a26ae2__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/a5e01e9275584171b1ade000d572404a__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/6c64cfbab5e548d7b21902beeeaeed48__jpg.heic","img_width":1200,"text":"通过列举两位数学家赫德逊和向克斯的计算发现,引导学生确切的得出结论,开阔了思路。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/5c7fd1aef16946b3977abdea4eaab2d5__jpg.heic","img_width":1200,"text":"揭示课题,总结研究发现,两个非零自然数相除的商是循环小数。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b7d135d34b57463cba6cb17fb1cb9740__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b1e22800655e4927a65989f0263846a9__jpg.heic","img_width":1200,"text":"关于循环小数,你还想研究哪些问题?可以参考这两本书,它们会告诉你的。
"},{"text":"反思:周老师能着眼于学生学习后的困惑,根据学生的实际情况,有针对性的设计了这节课的教学内容,并且在探究过程中,通过让学生对自己的猜想提出自疑,又不断的产生新的猜想,点燃了学生思维火花,把学生的思维引向纵深,为她点赞!
"}]},"ext":{"id":83866436,"article_id":76746966,"ip":"","origin_status":0,"edit_from":0,"client_type":0,"password_v2":"","uv":2,"font_id":0,"title_style":"","rich_text_title":null,"gift_switch":1,"deleted_at":0,"recycle_expired_at":0,"share_with_nickname":0,"enable_watermark":0,"music_id":0,"music_source":-1,"_auto_update_time":"2024-11-22 20:01:36"},"extend":{"article_id":76746966,"enable_download":1}},"author":{"id":28288221,"nickname":"🐯小玮","head_img_url":"https://ss-mpvolc.meipian.me/article/static/avatar.png","column_visit":27,"signature":"","favorite_count":0,"follow_count":0,"follower_count":0,"famous_type":0,"autoplay_music":1,"text_preference":2,"client_type":1,"reward_word":"如果喜欢我的作品,请打赏鼓励哦!","member_type":0,"wechat_id":"ojq1ttzpGS9QIxSuya2HOyqEn1LM","country":"中国","province":"浙江","city":"","career":null,"birthday":0,"gender":0,"reg_time":1512568507,"e_id":"","bedge_img":"","label_img":"","review_level":1,"enable_reward_switch":false,"enable_water_mark_switch":0,"plainNickname":"小玮","member_status":0,"member_img":"","ext":null,"phone_num":"186****8828","head_attach_img":null,"badge":null,"onlive":false,"qualification":null,"biz_info":{"is_biz_user":false,"share_domains":[]},"headwear":{"icon":"","animation":"","config":{},"param":{}},"cover_img_url":"","weibo_id":"","vwen_id":"","im_id":"2ef94002b99811002ca211ace0c5a065","yx_im_token":"","last_visit_time":1513240094,"ip_address":"124.160.213.180","device_id":"54a977dd09d14d4c99ff3b0ee3df914d","reviewer":0,"review_time":0,"account_state":0,"balance":0,"last_contribution_time":0,"member_expire_time":0,"member_qq_group":0,"web_has_login":0,"longtitude":"0.0000000","latitude":"0.0000000","last_client_type":1,"level":0,"province_user":null,"city_user":null,"user_id":28288221,"qq_id":"","apple_id":"","badge_img_url":"","reward_url":"https://www.meipian.cn/wap/reward/view/index.html?mask_id=z995ub1&author_user_id=28288221&article_title=%E2%80%9C%E6%9C%89%E8%B6%A3%E7%9A%84%E5%BE%AA%E7%8E%AF%E5%B0%8F%E6%95%B0%E2%80%9D%E2%80%94%E2%80%94%E5%91%A8%E8%8B%B1%EF%BC%88%E6%9D%AD%E5%B7%9E%E5%B8%82%E5%AD%A6%E5%86%9B%E5%B0%8F%E5%AD%A6%EF%BC%89","memo_name":""},"content":[{"text":"基于学生在学习\"循环小数\"后,对有关无限不循环小数等的一些课外知识的好奇和困扰,周英老师给我们带来了这节拓展性课。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/2056169dcce64f01b56019622f871e4c__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/3f8731834c8649918b1cc2f53c1cd446__jpg.heic","img_width":1200,"text":"课始,观看微课,通过计算聚焦到商的可能性,让学生对商是不是存在无限不循环的情况产生疑惑,引发思考,提出问题:两个数相除会不会出现无限不循环小数?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/6db7df3db8ec4ce1a8d66b8f460034b6__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/2ba826d450f74aa787be944ad13155ef__jpg.heic","img_width":1200,"text":"怎么研究?
生:通过计算。
给出4,9,10,17四个数,任选两个数相除
如果要出现商是无限不循环小数,最有可能是哪两个?
17÷9 4÷9 10÷17
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/33727d39b92c4b2cb7d526821dab1b29__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/022087aa9da3428a97d72caccc80f768__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/bd1a00215c42433a9d21eca64fe03a03__jpg.heic","img_width":1200,"text":"一起来研究10÷17的商会不会是无限不循环小数?
同桌合作:一个算,一个检查,并记录在表中。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/567c99eae3b644cf9cfb05732972adb9__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/558edd16fc6240ebb027a5d325ace0e0__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/49ccc3fa3779424395cfaa25ee1c42e1__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/5bd11c18978a415d941dbd1301384e59__jpg.heic","img_width":1200,"text":"答案是无限不循环小数么?
汇报结果。
它的循环节有几位?一起数一数。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/faad3504b9ba4e9e8861c31de6d919fb__jpg.heic","img_width":1200,"text":"对比两位学生的研究过程和计算方法,怎么判断它已经循环了?
你有什么发现?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/3fbd53d878504e11867c9510fe62baed__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/e74b97c3ea27432e9f7d7aabfe112370__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/801ceff030914e34b64a9eb2ad6501cd__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/9b65ac33fc2041e0a0317a3a21d5c69d__jpg.heic","img_width":1200,"text":"观看视频,边核对,边思考,为什么10÷17的商是循环小数?为什么循环节是16位?
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/24593cb369fe4e1183ce1e37396c7e83__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/95d0b912f6394267b91e75e798497b9b__jpg.heic","img_width":1200,"text":"通过圈一圈,画一画,写一写,发现循环节和除数的关系。
当余数出现重复,商才会循环。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/a81d3987b6c34797bd573df7a325d906__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/88628e8851ca4fdf8694848fe7927745__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/05752031eba640ef921ff1c75662e30f__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/e709be838b294b058fe703c88a4268ee__jpg.heic","img_width":1200,"text":"一个数÷23的商会不会是无限不循环小数呢?
生:可能是整数。
如果除不尽,有可能吗?你能从余数考虑吗?
那么( )÷27 和( )÷41 呢?
老师给出准确答案,验证刚才的猜想。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b3a53232a27e4a8e87f4b9c389c752ee__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/68936977d9024fc191a1f50b38a26ae2__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/a5e01e9275584171b1ade000d572404a__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/6c64cfbab5e548d7b21902beeeaeed48__jpg.heic","img_width":1200,"text":"通过列举两位数学家赫德逊和向克斯的计算发现,引导学生确切的得出结论,开阔了思路。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/5c7fd1aef16946b3977abdea4eaab2d5__jpg.heic","img_width":1200,"text":"揭示课题,总结研究发现,两个非零自然数相除的商是循环小数。
"},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b7d135d34b57463cba6cb17fb1cb9740__jpg.heic","img_width":1200},{"img_height":900,"img_url":"https://ss-mpvolc.meipian.me/users/28288221/b1e22800655e4927a65989f0263846a9__jpg.heic","img_width":1200,"text":"关于循环小数,你还想研究哪些问题?可以参考这两本书,它们会告诉你的。
"},{"text":"反思:周老师能着眼于学生学习后的困惑,根据学生的实际情况,有针对性的设计了这节课的教学内容,并且在探究过程中,通过让学生对自己的猜想提出自疑,又不断的产生新的猜想,点燃了学生思维火花,把学生的思维引向纵深,为她点赞!
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